Bug#822081: gnome-control-center: Mouse settings have no effect since 3.20

[Andreas Hehn]

> Do you have xserver-xorg-input-libinput installed? If not, do things work if you
> install it and restart your session?

Thanks! That fixes the problem. Now I also see additional setting
parameters for the touch pad.
Is there a way that the upgrade to 3.20 could install the package
automatically (dependency/recommendation)?
I don't recall having the problem before 3.20.

Andreas